The 50BR-160 from JFW Industries is a Variable Attenuator that operates from DC to 4 GHz. It has an attenuation range from 0 to 121 dB with a step size of 1 dB and has an accuracy of ± 0.6 dB. The attenuator has an insertion loss of less than 2.7 dB and can handle up to 1 watt of average input power. It can be controlled manually by rotating a knob to set the attenuation level. This 50-ohm attenuator is available as a benchtop unit with N-type (F) or SMA (F) connectors.